Inside function cz_get_performance_level(), pointer ps could be NULL via cast_const_PhwCzPowerState(). However, this pointer is dereferenced without any check, which is potentially unsafe.

Signed-off-by: Yizhuo yzhai003@ucr.edu --- drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c index bc839ff0bdd0..d2628e7b612d 100644 --- a/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c @@ -1799,6 +1799,9 @@ static int cz_get_performance_level(struct pp_hwmgr *hwmgr, const struct pp_hw_p data = (struct cz_hwmgr *)(hwmgr->backend); ps = cast_const_PhwCzPowerState(state);

+ if (!ps) + return -EINVAL; + level_index = index > ps->level - 1 ? ps->level - 1 : index; level->coreClock = ps->levels[level_index].engineClock;